Comment 1 for bug 1807073

Just got almost the same
Ubuntu 16.04 as guest on Centos 7 host,
all will latest updates.

Execute of
virsh qemu-agent-command inetgw2 '{"execute":"guest-fsfreeze-freeze"}'

failed with agent not available ( or something like this), but fsfreeze executed in OS
Apr 7 02:28:54 inetgw2 qemu-ga: info: guest-fsfreeze called

snapshot was created
after this
virsh qemu-agent-command inetgw2 '{"execute":"guest-fsfreeze-thaw"}'
failed too with agent not available

So Ubuntu 16.04 VM stuck in freezed i/o state.
 qemu-guest-age 1:2.5+dfsg-5

Same version...

Thank you!